Its a natural progression for any favored bull that the cuckold orally service him in front of the woman. It shows them both you submit to him as the alpha who sexually satisfies your lady, it honors his large hung cock and it shows her you accept he is her choice for the sexual alpha male lover and you want to settle into a submissive role and it starts by her seeing you suck and pleasure her lovers hung cock that may still have her juices and his cum on it. It tells her its ok to go forward with her feelings of attraction and you recognize how well he fucks her and that he is physically superior to you and in recognizing that, you want to leave no doubt your role has changed as the husband in the marriage, leaving her sexual pleasure to him. You will have to grow and change roles finally in a new level. But its ok, the gain for everyone is worth it and she will be more willing to spread her legs and fuck her lover in front of you and so will he since he can now humiliate you and further bond with her sexually as you no longer stand in the way, physically or mentally with either of them of returning to sexual provider. He or another bull will be her provider and she will understand you submit to her alphas fucking her and are not threatened by their feelings of each other. In fact, she may be encouraged to have you clean them both more frequently and help facilitate humiliation which further encourages her to have more sex with her lover. Because lets face it, when they saw me sucking a bulls cock, that was it, they immediately and instinctively knew I wasnt what they wanted sexually any longer. they wanted their alpha and I was moving to a submissive servant role sexually, supporting her needs first.